Г) $$(2,125·1\frac{15}{17}-1\frac{7}{12}):7,25$$

Г) Выполним действия:

1) $$1\frac{15}{17} = \frac{1 \cdot 17 + 15}{17} = \frac{32}{17}$$

2) $$2,125 \cdot \frac{32}{17} = \frac{2125}{1000} \cdot \frac{32}{17} = \frac{17 \cdot 125}{1000} \cdot \frac{32}{17} = \frac{125}{1000} \cdot 32 = \frac{1}{8} \cdot 32 = 4$$

3) $$1\frac{7}{12} = \frac{1 \cdot 12 + 7}{12} = \frac{19}{12}$$

4) $$4 - \frac{19}{12} = \frac{4 \cdot 12}{12} - \frac{19}{12} = \frac{48 - 19}{12} = \frac{29}{12}$$

5) $$7,25 = \frac{725}{100} = \frac{29 \cdot 25}{25 \cdot 4} = \frac{29}{4}$$

6) $$\frac{29}{12} : \frac{29}{4} = \frac{29}{12} \cdot \frac{4}{29} = \frac{1}{3}$$

Ответ: $$\frac{1}{3}$$